20221040400 has 120 divisors (see below), whose sum is σ = 70663390944. Its totient is φ = 4902067200.

The previous prime is 20221040383. The next prime is 20221040449. The reversal of 20221040400 is 404012202.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20221040400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 752749 + ... + 779148.

Almost surely, 2^20221040400 is an apocalyptic number.

20221040400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20221040400 is an abundant number, since it is smaller than the sum of its proper divisors (50442350544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20221040400 is a wasteful number, since it uses less digits than its factorization.

20221040400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531929 (or 1531918 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 20221040400 its reverse (404012202), we get a palindrome (20625052602).

The spelling of 20221040400 in words is "twenty billion, two hundred twenty-one million, forty thousand, four hundred".